Heat-treating machine



July 13 1926. 1,592,661

G. H. GILMAN HEAT TREATINGr MACHINE Filed May 23, 1921 4 Sheets-Sheet 1`y' www.

July A13, 1926. 1,592,661

G. H. GILMAN HEAT TREAT ING MACHI NE Filed May 25, 1921 lsheets-Sheet 2real/A In veo eo flgel. (Ei/Zwaan July 13 1926. 1,592,661

G. H. GILMAN HEAT TREATING MACHINE Filed May 23, 1921 4 Sheets-Sheet 5 lJuly 13,1926. 1,592,661

G. H. G ILMAN HEAT TREATING MACHINE Filed May 25, 1921 4 Sheets-Sheet 4Patented July 13, v1926.

UNITED STATES GEORGE n. GILMAN, or BELMONT, mAssAcHUsErrrs.

HEAT-TREATING MACHINE.

Appntion mea may as, '1921. serial No. 471,563.

My invention relates to heat treating machines and particularly but notexclusively to one for heat treating drill'steels.

My invention will be best understood from the following description whenread in thel light of the accompanying drawings of one specificembodiment of my invention selected for illustrative purposes, while thescope of my invention will be more particularly pointed out in theappended claims.

In the drawings:

Fig. 1 isa section on the line 1 1 of Fig. 2;

Fig. 2 is a plan view of the machine;

Fig. 3 is a more or less diagrammatic development `of the machine;

Fig. 4 is a section on the line 47-4 of F ig. 1;

Fig. 5 is a fragmentary section on the line 5-5 of Fig. 1; n l

Fig.- 6 is a view looking atFig. 5 from the left; l

' Fig. 7 is a fragmentary section on the line 7-7 of Fig. 2, with thecarrier moved into the plane represented by said line;

Fig. 8 is a sectionV on the 'line 8-8 of Fig. 7; j

Fig. 9 is a view looking at Fig. 7 from the right;

Figs. 10 and 11 area/respectively fragmentary sections on the lines10-10 and 11-11 of Fig. 2; n

llig. 12 is a section on the line 12-.12 of Fig. 11; and

Fig. 13 is a section on the line 13-13 of Fig. 2.

Referring tothe drawings in which the drill steels are indicated at a,`I have shown a plate 1 bent into the form of a cylinder` and havingupper and lower edges providing tracks 3 and 5 for the wheels 7 and 9ofthe drill steel carriers. Circumferentia'lly dis- 'tributed Aaroundthe machine, are shown, a

loading table 11, a heater 13, a. quenching .tank 15. and a mechanism 17for disengaging the drill steels from the carriers. l

. The carriers each comprise a leg 19 and an oppositely located leg 21vconnected to the vfirst mentioned by a cross bar 23, the leg 21 carryingthe rollers 7 and 9, and the U-shaped structure thus `formed straddlingthe track. The leg 21 is provided with apair of spaced perforated lugs25 for supporting a bar 27, the latter being square in cross-section andthe perforations having `a similar shape or the parts being otherwiseformed to spline the bar to the lugs. Each of the bars 27 is providedwith one or more spring clips 29 for engaging the drill steel, lwhilethe lower end of the bar is provided with a clamping mechanism,hereinafter described,

in= order that the drill steel may be securely yet detachably held bythe carrier. For giving the drill steel a motion transverse to thedirection traveled by Vthe carrier the lower end of the bar 27 is shownas provided with a roller 31 supported on the track 33 afforded bytheupper edge of the bar 35, the track being given an undulatory course soas to raise and lower the drill steel into and out of the variousinstrumentalities for heat treating the drill steel.

For propelling thecarriers, I have shown interiorly of the tracks aturret 37 which is mounted on a shaft 39 carried by the pedestal 41,fthe turret being provided with a skirt; having the internal series ofgear teeth 43 in mesh with the pinion 44 driven through suitablereduction gearing by an electric motor 45. As illustrated by thedrawings the lower end of the shaft 46 to which the pinion 44 is keyedcarries a worm wheel 47 and the latter is driven by a worm 48 carried bythe drive shaft 49 of the motor 45. The turret is further provided withcylindrical bores 50, reciprocably mounted in which are bars 51 carryingat their outer ends rollers 53 engaging'the cam track 55, the rollersbeing held against 'the track by .means of the compression springs 57abutting at one of their ends the bottoms of the bores 50 and at theirother ends engaging the roller 63 carried by brackets 65. formed in- Ytegrally with the leg 19, the roller engaging the track afforded by theinterior surface of the plate 1. The leg 19 and the brackets are soformed and spaced from the track that when the carriers are brought intoengagement with each other over the furnace, as will hereinafter bedescribed, each roller will project under the leg 19 of the carrier inadvance of it in order not to interfere with the abutting of thecarriers.

The action of the parts so far referred to is perhaps best illustratedby' Fig. 3. When the carrier is passing the loading table, the operatorinserts a drill steel in the carrier, and the turret, keeping thecarrier moving causes the roller 31 to move down the inclined portion 67of the track 33 and thus lower the end of the drill steel into theheater. When the steel has been moved into the heater the propeller headremains vin contact with the carrier long enough to push the row ofcarriers above the heater forward a distance equal to the Width of acarrier, and then is moved inwardly by the portion 69 of the cam track55 to disengage the carrier and permit those over the furnace to remainstationary, the row being gradually pushed forward step by step by theaddition of new carriers in the manner just described. The carrier atthe head of the row is engaged by the propeller head in advance of theone pushing the row immediately after the row is pushed forward, the camtrack 69 being so formed as to permit this engagement. Movement of thenewly -engaged carrier now causes the wheel 31 to move up the inclinedportion 71 of the track 33 which moves the drill steel out of theheater, and continued movement causes the wheel to move on thedownwardly inclined portion 73 of the track 35, whereupon the roller 3lruns down the incline by gravity and causes the whole carrier to advanceahead of the propelling head and to lower the drill steel into thequenching fluid. The drill steel and its carrier now remain stationaryuntil the propeller head catches up with the carrier and again engagesit. The drill steel now moves through the quenching tank, the rollerpassing over the slightly downwardly inclined portion 75 of the track 35so as gradually to increase the immersion of the drill steel. IVhen theroller 31 reaches the end of the quenching tank it moves up the incline77 and lifts the steel out of the tank, and when near or at the top ofsaid incline, the steel is disengaged from the carrier, as willhereinafter be explained, and the empty carrier again is moved over theloading table to receive a new drill steel.

For checking the carrier as the wheel 31 moves down the incline 73 I mayprovide a suitable brake, and as shown this brake takes the form of abar 79 carried by a plurality of arms 81 resiliently supported on theplate 1. The support for the arms as shown is in the form of a U-shapedbracket 83 having upper and lower fianges 85 perforated to receive thebar. The lower end of the bar 81 is screw-threaded for engagement withthe nut 87 which forms an abutment for a spring 89 having its oppositeabutment on the facing surface of the flange 85. By adjusting the nut 87the tension of the spring 89 can be varied, and for the same purpose andfor determining the distance between the bar 79 and the track 3, on thescrew-threaded portion of the bar is an adjustable head in the form of anut 91. Beyond the screw-threaded portion, the bar is reduced indiameter as indi-v cated at 93, this portion fitting the perforation inthe lower bracket to form a lower guide for the bar.

As illustrated by Figs. 3 and 6, the lower surface of the bar 79 isprovided with a bulged portion 95, which acts as a stop to insure thatthe carrier will come to rest at the bottom of the incline, and toinsure that the carrier will not roll ahead of the propelling head thebar 79 is extended along the track 3 for a distance corresponding to theinclined portion 75 of the track 35. For preventing the jumping of thewheel 31 off the track 33 I may provide at the inclined portions, orthroughout the entire length of the track, Figs. l and 3.

The clamping means hereinbefore referred to at the lower end of the bar27 herein comprises the rock shaft 99 provided with an extension 101vandan integral lever 103, the latter carrying at its outer end and inpivotal relation thereto the jaw 105. The surface of the jaw facing theextension is provided with the teeth 107, and when the jaw is moveddownward by turning of the rock shaft the steel is gripped between thissurface and the projection 101. In the end of the bar 27 is formed abore 108 in which is slidably mounted a plunger 109 provided with. a toe111 resting on the top of the lever 103, the toe extending through aslot 113 communicating'with the bore. In the bore and in engagement withthe upper end the guard rails 97 of the plunger 109is a compressionspring 115 causing the toe 111 constantly to press on the lever 103 tocause the jaw 105 to tend to move into its drill steel engagingposition. For moving the jaw out of steel engaging position I have showna bar 117,

the upper surface of which provides a cam track for the cam lever 119formed on the end of the rock shaft opposite the exten- `sion 101, saidbar being carried by the track `When the lever 119 meets the beveledportion it rides on the cam track to move the jaw out of engagement withthe drill steel.A

The opposite endof the bar is squared so that the lever will suddenlydropand cause thc jaw to grip the steel.

The discngaging mechanism 117, heretofore referred to, as illustratedcomprises a stationary standard 125 carrying hook shaped arms 127, theends of which are adapted to enter the space between the drill steel andthe bar 27 and by motion of the carrier to pull the drill steel out Ofthe clips 29. This occurs while the clamp 'at the bottom of the bore isstill in engagement with the drill steel in order that theupper end ofthe drill ste-el may be tilted outward to cause it to fall, and whilefalling pivot in the clamp, so that when the jaw 105 is disengaged fromthe drill steel the drill steel will fall away from the machine, and forthis purpose the beveled end ofthe bar 117 is in position to release thejaw after the drill steel has been pulled out of the clips.

vThe heater is arcuate in shape, conveniently having its center lineconforming to the path of the drill steels. As illustrated it comprisesa casting having a bottom 129 and the side and end walls 1 31. Supportedon the upper edges of the walls 131 are the flanges 133 of thetrough-shaped lead pot 135 which'extends into the casting as isillustrated in Figs. 1 and 3.. With the exception of the heatingsurfaces of the lead pot, the parts are lined with refractory material,for example, fire-brick 137, and dividing the interior of the castinginto a lower flue 139 and upper flues.141 and 143 are partitions 145 ofrefractory vmaterial extending transversely from the walls of thecasting to the bottom portion of the trough. The upper fiues are placedin communication with the lower iue by means of the openings 146 at oneend of the partitions, and the other ends of the flues 141 and 143 areconnected to each other by a transverse flue 147 formed around the endof the trough. The end of the flue 143 adjacent the flue 147is-connected to. a stack 148. The lower flue is provided with a bridgewall 149 and burner 150. The prodp ucts of combustion from the burnerpass along the flue 139 to the openings 146 where they enter the flues141 and 143 and traversing these flues finally pass into the stack ,148.The trough 135 is filled with material,

lrept molten by the heat imparted thereto from the flues, this materialpreferably being lead or other metal or alloy having a relatively lowmelting point and lending itself to easy regulation of temperature.

The burner 150 for the furnace conveniently is of the oil pulverizingtype having a valve controlled air supply connection indicated at 151 inEig. 4 and a similarly con trolled oil supply connection indicated atturned end which when the nozzle is sup. plied with air will act toinduce a draftvby ejector action. For supplying the air for 'the burnerand stack I have shown a blower or `other pump 154 geared by means ofabeltIk 155 to the pulley' 156 carried on the end of the shaft 49 of theelectric motor 45. The

discharge pipe 157of the blower leads around n the pedestal of themachine to a point ai cent the furnace where it is connected to the airintake of the burner and to the valve 158 controlling the amount of airpassing to the draft nozzle.

In order to vary the time the .drill steels are subjected to theheattreating instru mentalities any suitable means may be provided to'vary the Aspeed of the pinion 44. AAs shown the motor is intended to beof the variable speed type and the blower to be of suilicient capacityto-supply the necessary amount of'air at the lowest motor speed. It isobvious however that the blower may he driven by a separate motor orthat other gearing means may be provided for driving'the pinionaffecting the speed of the blower. For a-given temperature of theheaterthe time a drill steel. must remain in the heater to be heated to thetemperature at which it is to be quenched is a direct function of themass of the end portion of the drill steel, that is to s ay, a drillsteel with a large bit will heat more slowly than one with a small bit,and consequently by varying the speed of the pinion 44 the operator maysecure the proper quenching temperature of various sizes of hits withoutchanging the temperature of the heater.

As illustrated the quenching tank 15 is provided with an inletconnection 159 in communication with an interiorly tapered socket 161,in which is swiveledthe tapered end 163 of the nipple 165, to the latterof which is secured the pipe 167 having the upoutlet portion v169, asshown by Figs. 2 and 3, is located directly under the drill steel whenit comes to rest at the end of the in- Cline lowering the same into thequenching liquid. This causes the tip of the heated cutting end of thedrill steel, lowered into the quenching liquid,'to be subjected to thecold water projected against. it, which will harden the tip of thecutting end. The quenching tank'is further provided with an outletconnectionll, the water flowing from the inlet 159 to the outlet 171 inorder that the drill steel may be 'subjected to running water, which isfound to be of advantage. The gradual immersion of the heated portionfollowing the hardening of the tip gives a tough backingto the cuttingend.

Under some conditions it is desirable to quench the drill steel in aliquid other than Water, and for this purpose I herein arrangeinteriorly of the tank 15 a second tank 173 for containing oil, or ifdesirable any other quenching liquid. The tank 173 is provided withrollers 175 resting on the bottom of the tank 15 at the remotelyopposite sides of guides 177 in order that the tank 173 may be moved andguided into the path of the drill steel, the tank for this purpose beingmade arcuate in shape. To permit the movement of the tank 173 into thisposition the intake pipe 167 is permitted to swivel in the socket 161when the tank 173 pushes against it, and for causing the pipe to moveinto its proper position when the tank 173 is moved away from thisposition I provide the torsion spring 17S) and the stop 181, the latterengaging the back ot' the nipple 165 in the position illustrated by Fig.12 and being carried by the bottom of thetank15.

In the treatment of drill steels, I find it practical to heat thecutting end, bit, or point, as it is variously called, for about thelength of four inches and to dip it into the quenching fluid initiallyto a depth ot about ive-eighths of an inch and gradually to immerse theremainder. For treating the Shanks it is advisable to heat the drillsteel for about twice this length and to plunge as much of it aspossible into the quenching liquid With the initial movement. Forquenchingthe shank I may use the oil tank 173, and if necessary, havethe level of oil higher than the level of the Water in order` that thedrill steel Will be plunged immedi` ately to the full length of theheated portion. Vhen` treating the shank with Water the intake pipe 169may be moved into its dotted position shown by Fig. 2 and secured inthat position in any suitable manner in order that the shank Will notstrike the intake pipe. IiVhen treating the drill steel With oil it willbe noticed that the Water flowing through the tank 15 acts to keep theoil cool.

The loading table 11 herein is made adjustable in order to gage theposition of the drill steel on thecarrier and thus determine the amountof the end of the steel heat treated. Any suitable means for adjustingthe table may be provided, and as shown by Fig. 10 the same is mountedon the screwthreaded standard 183 carried in the nut 185. The nut isrotatably supported in a bracket 186 carried by the end of the furnaceand may be rotated by turning a hand Wheel 187 which is connected to aWorm 189 also mounted on the bracket and meshing with a- Worm Wheel191made integral With the nut. With thisv construction any suitable meansfor preventing the table 11 from turning when the nut is rotated may beprovided, and as shown the exterior surface of the flange 193 of thetable abuts the end surface 195 of the furnace.

It will be observed that with the loading table in the full lineposition illustrated by Fig. 3, if the end of the drill steel is heatedfor a length of four inches and initially plunged into the tank to adepth ot' tive-eighths of an inch, and the table is then lowered fourinches for treating the shank, the end of the drill steel will then beheated for a length of eight inches and will be in.- itially plungedfour and lve-eighths into the liquid. lith the table in its loweredposition, if the level of the liquid in one tank is three andthree-eighths inches higher than the level of the liquid in the other,and the higher level liquid is used for quenching the shank, the heatedportion of the shank will be plunged initially to the full length of itsheated portion.

Although I have described for purposes of illustration one specificembodiment of my invention it will be understood that I am not limitedtheretoJ but that wide deviations may be made therefrom Withoutdeparting from the spirit of my invention.

Claims-- 1. In a heat treating machine for t-he ends oi drill steels, aheat treating instrumentality, a conveyor for moving the drill steels tobe' treated. and having means for holding the drill steels thereon withtheir ends freely exposed for action thereon of said instrumentality,and means for moving said drill steels lengthwise relatively to saidconveyor Without removing them therefrom to bring their ends into thepresence of said instrumentality. i

2. In a heat treating machine for the ends of drill steels, a heattreating instrumentality, a conveyor for the drill steels to be treatedmoving along a definite path relative to said instrumentality, saidconveyor having means for holding the drill steels thereon With theirends freely exposed for action thereon of said instrumentality, andmeans for moving said drill steels relatively to said conveyor Withoutremoving them therefrom to bring their ends into the pres ence of saidinstrumentality.

3. In a heat treating machine for the ends of drill steels, a heattreating instrumentality, a conveyor for the drill steels to be treatedand moving along a definite path relative to said instrumentality, saidconveyor having a relatively movable part for carrying the drill steelsto be treated, and means for causing such relative movement to bring theends of the drill steels into the l presence of said instrumentality.

4. In a hea-t treating machine for the ends of drill steels, heattreating instrumentalities` a conveyor for the drill steels to betreated, and having means for holding the drill steels thereon withtheir ends freely -ties, -a conveyor having a body and arelativelyunovable part' for carrying drill steels to be treated insubstantially vertical position with their ends freely exposed foraction thereon of said instrumentalities,

means for moving the body of said conveyor along `a horizontal pathrunning from one instrumentality to the other, and means for causing therelative movement of said part for vertically moving the drill steelsfor effecting movement of their ends into and Yout of the presence ofsaid instrumentalities.

G. In a heat treating machine, heat treating instrumentalities, a track,a second track having an undulatory path relative the first track, aconveyor supported on said iirst track, a drill steel carrier carried by'said conveyor for movement relative thereto and supported on saidsecond track, and means for propelling said conveyor and carrier alongsaid tracks whereby said drill steels are moved into and out of thepresence of said instrumeiitalities.

7. In a heat treating machine, a plurality of heat treatinginstrumentalities arranged in end to end relation, a track at a constantlevel above said instrumentalities, an undulatory track, a conveyorhaving a part supported on the iirst track and relatively movable partfor carrying the articles to be drill steels for movement relativelythereto, and means for moving said drill steels relatively to saidconveyor to cause their ends after being subjected to said heater to beplaced in the quenching liquid in said quenching tank. r

l0. A machine for heat treating the ends of drill steels, having incombination, a heater, a quenching tank, a conveyor for drill steelstraversing said heater and quenching tank, said conveyor carrying saiddrill steels for movement relatively thereto, and means for moving 'saiddrill steels relatively to said conveyor to cause the tips of the endsof said steels after said ends are heated in said heater to be immersedabruptly in the liquid in said quenching tank and said ends then to beimmersed gradually in said liquid.

l1. In a heat treating machine, a heat treating instrumentality, aclosed track, a drill steel carrier mounted on said track for conveyingthe drill4 steels relatively to; said instrumentality, a revolublepusher for said carrier and mounted inside the space enclosed by saidtrack, and means carried adjacent the track and cooperating with saidpusher for causing said pusher to at Vtimes disengage said carrier.

l2. In a heat treating machine, a heat treating instrumentality, atrack, a plurality heated supported on the undulatory track,y=-13, In a,heat treating machine, a heat yand means for causing said conveyor`tomove along said tracks for advancing. raising and lowering said articleswhereby to etiect subjecting said articles successively to the action ofsaid instrumentalities.

S. In a heat treating maehine, a plural: ity of heat treatinginstrumentalities arranged in end to end relation, means providing apair of spaced parallel tracks at a constant level and running from oneinstrumentality to the other, a member supported on said tracks, meansfor causing said member to move along said tracks, a member for carryinga drill steel, means torV attaching said member to the first member forrelative movement thereto, and an undulatory track supporting saidmember carrying said steel.

9. A machine for heat treating the ends of drill steels, havinginicombination, a heater, a quenching tank, aconveyor for drill steelstraversing said heater and quenching tank, said conveyor carrying saidtreating instrumentality, av track, a carrier for the articles tobetreated mounted on said 'track for' conveying the articles relativelyto said instrumentality, a pusher for said carrier, means for causingsaid carrier to move ahead of said pusher, and a stop for causing saidcarrier to come to rest and remain stationary until said pusher catchesup to it.

14. In a heat treating machine, a heat treating instrumentality, atrack, af carrier for the articles to be treated mounted on said trackfor conveying the articles relatively to said instrumentality, a pusherfor said carrier, means for causing said carrier to move ahead of saidpusher, and a. resilient stop forcausing said carrier to\come to restand remain stationary until said pusher catches up to it.

15. In a heat treating machine, a heat treating instrumentality, a trackfor conveying the articles to be treated relatively to saidinstrumentality and having a downwardly inclined portion, a carrier forthe articles to be treated mounted on said track, means for causing saidcarrier to run down said inclined portion, and a stop for causing saidcarrier to come to rest at the end of said inclined portion.

16. In a heat treating machine, a heat treating instrumentality, atrackfor conveying the articles to be treated relatively to saidinstrumentalit and having a downwardly inclined portion, a carrier forthe articles to be treatedmou'nted on said track, means for causing saidcarrier to run down' said inclined portion, and a friction brake forchecking the speed of said carrier.

17. In a heat treating machine, a heat treating instrumentality, a trackfor conveying the articles to be treated relatively to saidinstrumentality and having a downwardly inclined portion, a carrier forthe articles to be treated mounted on said track, means for causing saidcarrier to run down said inclined portion, and a combined friction brakeand stop for said carrier for checking and arresting motion of saidcarrier.

18. In a heat treating machine, a heat treating instrumentality, a trackfor conveying the articles to be treated relatively to saidinstrumentality and having a downwardly inclined portion, a carrier forthe articles to be treated and mounted on said track, means for causingsaid carrier to run down said inclined portion, means acting as a brakefor said carrier, and a stop for bringing said carrier to rest.

19. In a heat treating machine, a heat treating instrumentality, a trackfor conveying the articles to be treated relatively to saidinstrumentality and having a downwardly inclined portion, a carrier forthe articles to be treated mounted on said track, means for pushing saidcarrier along said inclined portion for advancing and moving saidarticles vertically relatively to said instrumentality, and a frictionbrake for preventing said carrier from moving faster than said pusher.

20. In a heat treating machine, a heat treating instrumentality, a trackfor con.- veying the articles to be treated relatively to saidinstrumentality and having a downwardly inclined portion, a carrier forthe articles to be treated and mounted on said trackmeans for pushingsaid carrier along said inclined portion, and means preventing saidcarrier while traveling over said portion from moving ahead of saidpusher.

21. In a heat treating machine, a heat treating instrumentality, a trackfor conveying the articles to "be treated relatively to saidinstrumentality, a carrier mounted on said track, means for pushing saidcarrier valong the track, and a brake for said carrier.

22. InV a heat treating machine, a heat treating instrumentality, atrack for conveying the articles to be treated relatively'` to saidinstrumentality, a carrier having wheels mounted on said track, meansfor pushing said carrier along the track, and a brake for said wheels.

` 24. In a heat treating machine for drill steels, a track having adownwardly inclined portion a carrier for said drill steels having awhee riding on said track, a pusher for pushing said carrier along saidtrack, and a member resiliently held in spaced relation to said trackand parallel thereto for engaging said wheel whereby to act as a brakefor said carrier preventing it from moving ahead of said pusher.

25. In a heat treating machine, a furnace, a quenching tank, a conveyorfor moving the articles to be treated through said furnace and quenchingtank, and an adjustable gauge for determining the position of saidarticles on said conveyor relatively to the furnace and quenching tank.

26. In a heat treating machine for the shank and point of drill steels,a furnace, a quenching tank, a carrier for conveying said steels throughsaid furnace and quenching tank, means affording a gauge for positioningthe steel on said carrier when treating said shank, and means aiording agauge for dili'erently positioning said steel when treating said point.

27. In a heat treating machine for drill steels, a heater, a quenchingtank, and means for conveying said steels through said furnace andquenching tank, said means pro viding for the treatment of a greaterlength at the shank end of said steel and for the treatment of a lesserlength at the point end of said steel.

28. In a heat treating machine for drill steels, a heater, and means forraisin@ and lowering said steels into and out of said heater andproviding for the heating of a greater length at the shank end of saidsteel and for the heating of a lesser length at the point end of saidsteel.

29. In a heat treating machine for drill steels, a quenching tank, andmeans for raisin and lowering said steels into and out of said tank andproviding foi` the quenching of a greater length at the shank end ofsaid steel and for the quenching of a lesser length at the point end ofsaid steel.

30. In a heat treating machine for the shank and point of drill steels,a quenching tank, and means for raising and lowering said steels intoand out of said tank and providing for the quenching of the previouslyfor drill steels or thel like, means for clamping sa1d steel t0 saidcarrler, and said means permitting said steels While clamped therein topivot relatively of said carrier during re- A Y Ainto and through saidquenching tank to moval. 32. In a heattreating machine foor drillsteels, a heat ytreating instrumentality for treating the ends of thedrill steels, a conveyor moving in a fixed path relatively to saidinstrumentality for moving the drill steels through-saidinstrumentality, means on said conveyor for holding the drill steelsthereon, a gauge for contacting the ends of A the drill steels to betreated for determining their position on said conveyor, and means foradjusting said gauge relatively to said conveyor for varying theposition of the drill steels relatively to said conveyor.

33. Inaheat treating machine, a carrier for drill steels or the like,spaced means on said carrier for gripping said steel at spacedv pointsalong its length intermediate its ends, and means for disengaging one ofsaid means from said steel before another is disengaged.

34. In a heat treating machine, a carrier for drill steels or the like,spaced means on said carrier for gripping said steel at spaced pointsalong itslengtlr intermediate its ends, means for disengaging one ofsaid means from said steel and pushing the adjacent portion of the steelaway from the carrier and for afterwards disengaging another of saidmeans 35. In a heat treating-machine,.a carrier, means for moving saidcarrier along a definit'e path, a means for holding a drill steel onsaid carrier, other means for holdinga drill steel on said carriercomprising means for gripping said steel spaced longitudinally of thesteel from the iirst mentioned holding means, means for disengaging thesteel from said first mentioned holding means and pushing the adjacentend oflahe steel away from said path, and means for afterwardsdisengaging the steel from said gripping means.

36. In a heat treating machine for drill steels, a quenching tank, aconveyor for moving the steels in substantially vertical position Withtheir ends in the fliquid in said tank, meansxon said conveyor forholding a steel thereon comprising means releasably engaging said steelat spaced points intermediate its ends and permitting said steel to tiltrelatively to said conveyor about the lowermost of said spaced pointswhen' said steel is otherwise disengaged from said conveyor, and means`for disengaging said steel from said holdingmeans after said steel hasbeenquenched, said means effecting release of said steel at said'lowermost point after said' steel has been otherwise disengaged fromsaid conveyor and tilted.

37. In a heat treating machine for the Vends of drill steels, alead-pot, a quenching cool them. A

38. The method of heat treating drill steels which consists in heatingthe endthereof in a bath of molten lead, then plunging the end so heatedfor a predetermined distance in quenching liquid and afterwardsgradually immersing the remainder of said heated portion' in saidliquid.

39..In a het treating machine, a longitudinally extending trough formolten metal, a-burner beneath said trough, a flue conducting theproducts of combustion beneath said trough to one end thereof, a stackand a return lue/atthe side of said trough connecting the. first flue tosaid stack.

40. In a heat treating machine, means for heating the end only of a rodlike article to be treated, and means providing for selectivelyquenching the heated end of said article in liquids of diderentcharacteristics.

4l. In a heat treating machine, means for heating the end only of a7 rodlike article to be treated, and means providing .for selectivelyquenching the heated end of said article in either an aqueous liquid orin oil.

' 42. In a heat treating machine, means for heating the end only of`arod like article to be treated, and means providing fr selectivelycausing the heated end of said article to be plunged into` any of aplurality of quenching tanks to cool it.

43. In a heat treating machine, a conveyor for previously heated drillsteels, and means for selectively causing said steels to pass throughvany of a plurality of coolers to quench them.

44. In a heat treating machine, means for heating an article to betreated, a plurality of quenching tanks containing quenching liquids atdierent levels, and means for causing the heated article to be plungedinto either tank.

45. In a heat treating machine, a plurality of tanks containingquenching liquids, means for moving a previously heated drill steelthrough a definite path While quenching it, and at least one of saidtanks being movable to enable it to be placed in or removed from: -thelpath of said steel, f

47. In a heat treating machine, means for conveying previously heateddrill steels, a tank in the path of said steels and having a water inletand outlet, a second tank inside the irst and being movable to permit itto be moved into or out of the path or" the drill steels.

48. In a heat treating machine, a tank having an inlet and anoutlet,'means for placing the previously heated ends of drill steels insaid tank over said inlet and allowing them to remain for apredetermined time and then removing them from said inlet.

49. In a heat treating machine, a tank having an inlet and an outlet,means for placing the tips of previously heated ends of drill steels insaid tank over said inlet and allowing said tips to remain there for apredetermined time, said means then moving said steels away from saidinlet toward said outlet while gradually lowering the remainder of theheated ends into said tank.

50. In a heat treating machine for drill steels, a furnace for heating`the end portions of said steels, a quenching tank, an inlet and anoutlet for quenching fluid for said quenching tank, said inlet adaptedto project quenching fluid lengthwise of said drill steels when thelatter are placed in said tank, and means for removing said steels fromsaid furnace and allowing them to remain stationary relative to saidinlet for a predetermined time in vposition to have the quenching fluidfrom said inlet projected against the ends only of their heated portionswhile the remainder of their heated portions are positioned above theliquid in said tank, and then gradually to immerse said steels in saidquenching iuid progressively to quench the remainder of said heatedportions.

5l. The combination with a quenching tank containing a liquid forquenching previously heated ends of drill steels and having a verticallydirected inlet. opening and an outlet opening for the quenching liquid;of a conveyor for placing the drill steels in vertical position over theliquid in said tank and allowing them to remain stationary with thetipsY only of their heated ends immersed in said liquid over said inletopening, and for afterwards removing said steels from their positionover said inlet opening and gradually immersing in said liquid theremainder of the heated ends.

52. The combination with a quenching tank containing a liquid forquenching previously heated ends of drill steels and having an inlet andan outlet for quenching Huid, of means for' placing the drill steelsvertically over the liquid in said tank and allowing them to remainstationary with the tips only of their heated ends in position to havethe liquid entering the tank by way of said inlet projected against saidtips, and for then moving said steels away from said inlet toward saidoutlet while gradually immersing in said liquid the remainder of theirheated ends. 'f l In a heat treating machine, a heater, a conveyor formoving the articles to be heated, a pump for said heater, means fordriving said conveyor and pump in fixed speed relation to each other atvariable speeds, and said pump being of such capacity that its output iswithin the maximum of its requirements at its lowest speed.

54. In a heat treating machine, a uid consuming heat treatinginstrumentality,a pump for said iiuid, a Conveyor for the articles to betreated, means for driving said Conveyor and pump in fixed speedrelation to each other at variable speeds, and said pump being of suchcapacity that its output is within the maximum of its requirements atits lowest speed.

55. In a heat treating machine for the ends of drill steels, theCombination with a heater and a cooler, of a conveyor for moving thedrill steels for progressively subjecting their ends only to said heatera'nd cooler', and means for driving said conveyor at different speeds.

56. In a heat treating machine for the ends of drill steels, a heater, acooler, means for moving said steels to bring their ends only` into thepresence of said heater and for removing said ends from the presence ofsaid heater after they are heated and subjecting them to said cooler,and means for varying the time said ends are subjected to said heater.

57. In a heat treating machine for the ends of drill steels, a heater, aquenching tank, conveyor means for moving the ends of the drill steelsthrough said heater and tank successively, means for driving saidconveyor at different speeds lfor accoinmodating the mass of the ends ofsaid steels to the heating capacity of said heater, and said tank being'of sufficient length to permit effective quenching of said steels atall speeds of said conveyor.

58. In a heat treating machine forA the ends of drill steels, a heater,a quenching tank, conveyor means for moving the ends of the drill steelsthrough said heater and tank successively and at a greater speed throughsaid tank than through said heater, and means for varying the effectivespeed of travel of said steels through said heater.

59. In a heat treating machine for the ends of drill steels, a. heater,means for moving said drill steels step by step with their ends in saidheater and removing them from said heater after they are heated, andmeans for varying the time said ends of said steels are in said heater.

60. In a heat treating machine for the ends of drill steels, a heater, aquenching tank, means for moving drill steels step by step in a rovi7with their ends in said heater and removing drill steels from thel endof said row to said quenching tank after they are heated While addingnew drill steels to the opposite end of said roW, and means for varyingthe time said ends are in said heater.

6l. In a heat treating machine having a furnace provided with an airoperated burner, a conveyor for the articles to be 10 treated, a sourceof power supply, reduction gearing operatively connecting said source tosaid conveyor, and an air pump for said burner operatively connected tosaid source independently of said reduction gearing.

In testimony whereof, I have signed my name to this specification.

GEO. H. GILMAN.

